Synthetic resin product and process



Patented Nov. 1935 SYNTHETIC RESIN PRODUCT AND PROCESS Walter Wollaston,North Mnskegon, Mich, as-

signer to The Brunswlok-Balke-Collender Company, Chicago, 111., acorporation of Delaware No Drawing. Application March 24, 1032, SerialNo. 601,054

Claims.

This invention relates to an improved-synthetic resin product andprocess of malgingsarne, and has for one of its principal objects theprovision of a new condensation product which shall em- 5 ploy a ureaformaldehyde resin 'modifled by the addition of a phenol formaldehyderesin and a phthalic anhydride glycerin resin in its formation.

One of the objects of this inventionis tojprovide a synthetic resinwhich shall be relatively inexpensive and easy of manufacturesandwhichcan be molded by heat and pressuredntoblocks or slabs capable of beingworked irito ivarious shapes. e

Another object of the invention is provide an improved synthetic resincapable of 1 being molded by heat and pressure into relatively mas-'sive blocks which can then be worked into various shapes, and which willbe free froma tendency elements. Blocks of this composition,furthermore, will not be subject to cracking or cheek ing whetherretained in their original molded form or after machining. 1

Another and further important 0 invention resides in the provision of acondensation product of an aliphatic aldehyde preferably of formicaldehyde with carbamid or carbamid ucts with synthetic resins orresin-forming substances, with or without fillers or coloring agents.

Other and further important objects of the invention and the processwill be apparent from the disclosures in the following specification.

The improved resin of this invention may have the following generalcomposition:

Phenol formaldehyde resin Glycerin, phthalic anhydride glycerin resin,or a plasticizer 1 to 10% Urea formaldehyde resin 40 to 70% Filler fornecessary body and color tocomplete The urea formaldehyde resin can beprepared by boiling urea and formaldehyde in the presence of an acidcatalyst such as phthalic anhydride, until the major portion of thewater is removed, and the product is still fusible.

The phenol formaldehyde resin is prepared in the usual manner, using anacid catalyst, but the reaction is not continued until the productattains an infusible form.

The phthalic anhydride glycerin resin is prepared from phthalicanhydride and glycerin by heating phthalic anhydride with glycerin untilinto discolor due to exposure to sunlight or the umbrella handles, bjectof the derivatives and further mixture of these prodoxide, titaniumoxide, barytes, or the like, to-

. gether with any desired coloring. Mixing with heating is thencontinued until the composition 10 sets up to a stiff consistency.

. The material is then allowed to cool, after which it is ground anddried at approximately C. until it just retains sufllcient thermalplasticity to enable molding under heat and pres- 1 sure into densesolid masses. This material is then milled to a fine powder and pressedin a positive type mold, under approximately 3,000 pounds per squareinch pressure at approximately -C.,.until the product is substantiallyinfusible. 0

This procedure results in a hard, practically infusible substance whichcan be worked, out, or shapedinto various objects, such as billiardballs.

0 dishes, portions of tools, insulating elements, toys, or the like,which will 25 not change materially in color upon exposure to light, andwhich will not develop checks or cracks either before or aftermachining.

The proportions and nature of the ingredients used and also the methodinvolved in the manufacture can be varied considerably to meet certainrequirements as found necessary or desirable. For example, glycerinalone may be used as a plasticizer; and other plasticizers may beemployed, such as dibutyl phthalate or any organic plasticizer, but inany event not condensed to an infusible condition.

I am aware that many changes may be made in the ingredients andproportions and numerous 40 details of the process varied throughout awide range without departing from the principles of this invention, andI therefore do not purpose limiting the patent granted hereon otherwisethan as necessitated by the prior art.

I claim as my invention- 1. A pressed urea formaldehyde phenolformaldehyde phthalic anhydride glycerin product.

2. A pressed urea formaldehyde phenol formaldehyde phthalic anhydrideglycerin resin char- 50 acterized by the presence of inherent color.

3. A hard, infusible reaction product of a urea formaldehyde resinmodified by the addition of a phenol formaldehyde resin and phthalicanhydride glycerin resin.

4. A hard, infusible reaction product of a urea formaldehyde resin, madein the presence of an acid catalyst and modified by the addition of aphenol formaldehyde resin and a plasticizer such as phthalic anhydrideglycerin resin.

5. A hard, infusible reaction product of a urea form: dehyde resin, madein the presence of an acid catalyst and modified by the addition of aphenc 1 formaldehyde resin and a plasticizer such asplithalicanhydride-glycerin resin, together with a filler.

6. A process of preparing a condensation product by preliminarilypreparing a urea formaldehyde "esin in the presence of phthalicanhydride and combining it with a phthalic anhydride glycerin resin anda phenol formaldehyde resin.

7. A process of preparing a condensation product by preliminarilypreparing a urea formaldehyde resin in the presence of phthalicanhydride and combining it while in a fusible state with a phthalicanhydride glycerin resin and a phenol formaldehyde resin.

8-. A process of preparing a condensation product by combining a ureaformaldehyde resin with a phenol formaldehyde resin and a phthalicanhydride glycerin resin, all in a fusible state, and heating and mixingthe same with a filler until the composition attains a stir!consistency. 5

9. A process of preparing a condensation product by combining a ureaformaldehyde resin with a phthaiic anhydride glycerin resin and a phenolformaldehyde resin with a filler and mixing and heating until thecomposition attains 10 a stiff consistency, then cooling, grinding anddrying at 110 C. until the composition has just sufilcient thermalplasticity to mold under heat and pressure.

10. A process of preparing a condensation 15 product by combining a ureaformaldehyde resin with a phthalie anhydride glycerin resin and a phenolformaldehyde resin with a filler and mixing and heating until thecomposition attains a stiff consistency, then molding under heat and 30pressure, and finally shaping and finishing.

WALTER WOLLAS'IUN.

